Asprosin impairs insulin secretion in response to glucose and viability through TLR4/JNK-mediated inflammation
- Authors
- Lee, Taeseung; Yun, Subin; Jeong, Ji Hoon; Jung, Tae Woo
- Issue Date
- Apr-2019
- Publisher
- ELSEVIER IRELAND LTD
- Keywords
- Asprosin; TLR4; JNK; Inflammation; Apoptosis; MIN6; beta-Cell
- Citation
- MOLECULAR AND CELLULAR ENDOCRINOLOGY, v.486, pp 96 - 104
- Pages
- 9
- Journal Title
- MOLECULAR AND CELLULAR ENDOCRINOLOGY
- Volume
- 486
- Start Page
- 96
- End Page
- 104
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18058
- DOI
- 10.1016/j.mce.2019.03.001
- ISSN
- 0303-7207
- Abstract
- Severe inflammation in the islets is observed in obese patients with type 2 diabetes. Inflammation in the islets is caused by obesity-induced serum free fatty acids. Asprosin is a fasting-induced adipokine, which contributes to hepatic glucose production. However, the effects of asprosin on inflammation and cellular dysfunction in pancreatic beta-cells remain to be elucidated. Here, we demonstrated that treatment of mouse insulinoma MIN6 cells and human primary islets containing beta-cells with palmitate increased asprosin expression and secretion. Treatment of MIN6 cells and human primary islets with palmitate increased phosphorylation of the inflammatory marker nuclear factor-kappa B (NF kappa B) and the release of pro-inflammatory cytokines including TNF and MCP-1 and decreased glucose-stimulated insulin secretion and cell viability. However, siRNA-mediated suppression of asprosin reversed these changes. Recombinant asprosin treatment of MIN6 cells and human primary islets augmented the inflammation response, cellular dysfunction, and apoptosis in a dose-dependent manner. Asprosin induced toll-like receptor (TLR) 4 expression and JNK phosphorylation. siRNA for TLR4 or JNK mitigated the effects of asprosin on inflammation and cellular dysfunction. These results suggest that palmitate-derived asprosin secretion from beta-cells results in their inflammation and dysfunction through a TLR4/JNK-mediated pathway. This report suggests asprosin as a novel therapeutic target for the treatment of type 2 diabetes through preservation of beta-cell function.
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